Pipe or casing dent remover.



L. F. BAASH.

PIPE 0R CASING DENT REMOVER. APPucATxoN' FILED FEB.13,1915.

Patented Oct. 19, 1915.

as the indentationsrinhibit;thepassingzpof j Unir-nn srnrns- MTZENT GEHUSE; L t

LAWRENCE, F'. BAnsH, or rfL'LMoRE, CALIFORNIA. A

' PIPE on oAsING DnNrzeEivrovEn.

'Be it Vlrnovvn that I, LAWRnNoE F.' BAS,

av subject of the Emperor ofI Germany, re-

siding at Fillmore, in the county of Ven.'- tura, State of California, have invented' new l,and useful Improvements in Pipeor Casing `Dent Removers, of which the following is a specification. j.'

This` invention relate-Stora tool for removingdents from; pipe ory tubing such as casingsfor oil-Wells and the like.

lnthefconstrucjtion of oil-,V el'ls, tubular metallic casingsg.f are4 sunkl intoA the earth Atogre'a't depths, ,'itjbeing customary to'rstv Sink 'Strnsefsusig 0i' 01.1@ @metes-then lower a Vsecond String; 'of casing of" smaller f diameter throifigh' the first stringr and so` on,

' thus'y 'employing casings fof' Various diameters, fwithj each succeeding string, ofzcasings vof such Voutside diameterj that itgvvill clear the inner `fivallsofjthepreceding string. It

is therefore essential', that the outer casings bel free from indentations in order to per- Vn uitfthe free passage therethrough of a` suc'- ceeding string of casingoffslightly less-dameter and also permit thevlowermg oftools Ytherethrough.` Thepipe or l Well kcasing Ybev Acomes dented from various causes, especially aftervthe casing has been. sunk and therei-y afterfremoved, and is thusY unfitted for use the smaller-casing sections andtools'therethrough, which necessita esjthe removal of the indentations.V v

Itis the ob'ect of invention to provi'dea tool by means of which dentsy inV a pi quickly removed.`

f Another iob `ect is to provide a'icas'ing dent remover Which'is so constructed that may be introduced into a tubularfcaslng of considerablelength and operated Ito presfsin- Y Ydentations in the casing Walljoutwardly to, `restore lthe,V casing to its normal condition andwhich embodies means whereby the dent removingr devic e can bev operated fromeith'er end of a casing or pipethereof; Y'

A further object is toprovide a dent lre Vmover. having a Aball-seated or'swiveled shoe formedk with a transversely curved operating'V face of a y radius les'sthari the radius of thecasingjand adapted. to readily seatfon lthe inner cylindrical Wall ofthev pipeor'cas- *ing to insure complete removal off the dent,

on `the shoe being 'pressed thereagainst.

. Specification of Letters Patent. .Y apinicationmea February 13, 1915. serial no. 9,212.

pe orryvell casing maybe `easily `'and y line 2 2 of Fig. 1,;partly in elevation'. Fig.

3 isa view in cross section similar toFig.

.Y ,Y The invention is illustrated v1n the ac- 2, shovvinga removable "cap `on thefshfoel illustrating theA device as adapted for use iii"'cas ings of vlarge diameter. Fig. @is a view inflongitudinal section 'of a modified form of the, invention; I Fjgis ayievv in section"Tand 'elevation asf: seen on the'lli'ne 'f-fofFig". 4,' as 'seenin the direetion in- 'dicated by t'he'a'rroWsjIY' and having aftransverse arcuateunderwside 'conforming'fto and. adapted jto seat onthe y inner-.cirumferential Wall of the' casing'r'l() In v.the preferred l formi 'of theinivfention,

shoWnfi'n F ilgs. lf and2,the body member 12 is formedfonwits upperface Witha cylindri- Vcal depression B-'arran'ge'd centrally thereof, vinfvv'l'iic fplunger'leis reciprocally lmounted andfadaptedy to move in a .'dire'c#vv tion at right .angles to the axis of the cas# ing; The plunger'nl isad 'with greep, leathenl' on its under sideV and isform'ed A With a ,substantially semispherical member 16. onits fupper'end Ywhich extends'- into ay `socket 1 17 forIlled 1 on they under j side Lofqa f roo fThe sho-e118 has'aftransverse Varcuate vup- 'y Y per face lformed-on a radius'less than 'the radius of th'e' inner'Wall` o'fE the casing yl()v v -sothatvvhenfthe shoe 1,8y is caused to-"b'earkA f' againsti the casing l0 inl removing: ythe dent `v1214,itvvvill Operate to press tlfiefdefntfout-V VWardly a slight `d`i'stanceb`eyond theffouter .falceof-the casing,ias`vvill be later described.

.'lhe v shoe 18 preferably';E rectangular in 7.5-A VMore specifically ,l0jindicates aftubfular `4 f -inetalliccasing and l1 denotes aldent'fornied Y i `-therei1i. The present invention resides in'a deviceV by means offWhich the der tfllvmayl be removed fandjemb'odiesy a' body member l12 4 -adapted to 'be disposed'Wit-hin thev casing 10 v r facefof the body member 12 "being formed plan and is disposed on the plunger 14` with its arcuate face corresponding to the curvature of the inner wall of the casing. The under side of the shoe 18 is spaced from the base of the semi-spherical member vdepression 13 through a lpassage 20 formed in the body member 12 as shown in Fig. 1. Mounted on the outer end of the pipe 19 and opening thereto is a cylinder 21 having a Acap 22 on its outer end and extending into the cylinder 21 through a threaded aperture in the cap 22 is a threaded stem 23 which is designed to be rotated and moved longitudinally to reciprocate a piston 24 mounted thereon. Y

The piston 24 is 'providedwith a cup leather 25, and interposed between the cup leatheri25 and the cup` leather 15 `on the plunger 14 is a body of liquid, preferablyv oil, through which movement may be transmitted to the plunger 14 by advancing the threaded stem 23 and piston 24. The stem 23 is fitted with a crank 26 by which it may be manually `rotated to advance or retract same in its threaded bearing to effect movement of the piston 24 and thereby cause the plunger 14 to move at right angles to the axis of the casing or pipe. Y

1n the operation of the form of the invention just described, the piston 24 is retracted to permit the plunger 14 to gravitate downwardly in the depression 13 so` as to dispose the upper face of the shoe 18 clear of the dent 11 inthe casing l() into which the body member 12 is introduced. The device is positioned in the casing 10 with the center of the plunger 14 beneath the dent 11. The casing 10 being previously heated adjacent the dent 11 to render it malleable, the stem 23 is rotated by means of the crank 26 to advance the piston 24 which will operate through the liquid in the pipe 19 to move the piston 14 toward the wall of the casing and causethe shoe 18 to press against the under side of the dent 11 and force the latter outwardly; the area of the plunger 14 being greater than that of the piston 24 so that increased force will be ltransmitted to the plunger. The arcuate face of the shoe 18, by reason of being formed on a radius less `than the inner arcuate wall` of the casing 10,

will force the dent outwardly a slight distance beyond the outer face of the casing 10 so that when the latter cools and shrinks the previously indented portion of the casing will extend flush with the casing wall.

In event the shoe 18 is not positioned di- Ving 10.

rectly beneath the dent 11, the shoe will rock Von its swivel mounting on the plunger 14 so as to equalize the strains on the plunger 14 and prevent binding of the latter in Vthe depressi.on13; the swivel mounting of the shoe 18 also insuring its being positioned to conform to the curvature of the casing 10.

When it isY desired to retract the plunger 14, the stem 23 is rotated in a reverse direction to retract the piston 24, thus relieving the plunger 14 of pressure on its under side and permitting it to gravitate to its normal position.

1n the modified form of the invention illustrated in Figs. 4 and 5, the shoe 18 is seated on a ball 27 carried on a threaded stem 28 engaging an internally threaded sleeve 29 mounted in the body member 12. VThe stem 28 is formed with a longitudinally extending channel 30 engaged by a lug 31 on the body member 12 by means'of which the stem 28 is held against rotation but is permitted to have longitudinal movement in relation to the body member 12. Formed on the sleeve 29 is a beveled gear 32 which meshes with a pinion 33 Von a shaft 34 having one end journaled in the body member 12 and its outer end extending exteriorly of .the casing 10. .The shaft 34 may be rotated by meansvof a hand-wheel 35 mounted on its outer end. In the operation'of this form Yof the invention the'shoe`18 is advanced or retracted by rotating the sleeve 29 through themedium of the gear 32 and pinion 33 and shaft 34; rotation vof the sleeve 29 operating to move the stem 28 longitudinally at right angles to the axis of the casing or i e. Y

QVhen itis desired to adapt the device for use in casings of large diameters the body member 12 and the shoe 18vare fitted with the demountable caps 36 and`37, respectively, as particularly shown in, Fig. 3; the cap 36 having a curved under face formed on a radius corresponding to that of the .casing 1()v and the cap 37 having an upper face formed .on a radius less than the radius of the casing. The caps 36 and 37 may be attached to the body member 12 and shoe 18 in any desired manner; screws 38 being here shown as provided for that purpose.

lt is manifest that various means may be employed for reciprocating the plunger 14 or advancing and retracting the shoe 18 by which the latter may be moved in and out of contact with v'the inner wall of the cas- VVhat l claim is: 1. A casing dent remover comprising a body having an arcuate lower face and forming a tubular chamber on its upper face, a

plunger .reciprocallymounted in said chamber, a slice having a transverse arcuate face, a ball and socket connection between said shoev and plunger `whereby the shoe may Copies of this patentmay be obtained'for v BL leading to the lower part of said tubular. chamber and a plunger for forcing thev fluid`Y through `said conduit-A into ysaid' chamber, 1b substantially as described. f

In Witness that I claim the foregoing I have hereunto subscribed my name this 6th day of Feb., 19.15.

` Witnessess f i LULA MA'EVTODD,

JN0. A. GALVIN.

ve cents each, by addressing the Commissionerof ZPatenizex WaVshington, D.0. f

LAWRENCE F. BAAsH. f 

